<?php
/**
 * Nextcloud - News
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author Alessandro Cosentino <cosenal@gmail.com>
 * @author Bernhard Posselt <dev@bernhard-posselt.com>
 * @copyright Alessandro Cosentino 2012
 * @copyright Bernhard Posselt 2012, 2014
 */

namespace OCA\News\Service;

use OCA\News\Db\Item;
use OCP\IConfig;
use OCP\AppFramework\Db\DoesNotExistException;

use OCA\News\Db\ItemMapper;
use OCA\News\Db\FeedType;
use OCA\News\Config\Config;
use OCA\News\Utility\Time;


class ItemService extends Service {

    private $config;
    private $timeFactory;
    private $itemMapper;
    private $systemConfig;

    public function __construct(ItemMapper $itemMapper,
                                Time $timeFactory,
                                Config $config,
                                IConfig $systemConfig){
        parent::__construct($itemMapper);
        $this->config = $config;
        $this->timeFactory = $timeFactory;
        $this->itemMapper = $itemMapper;
        $this->systemConfig = $systemConfig;
    }


    /**
     * Returns all new items
     * @param int $id the id of the feed, 0 for starred or all items
     * @param int $type the type of the feed
     * @param int $updatedSince a timestamp with the last modification date
     * returns only items with a >= modified timestamp
     * @param boolean $showAll if unread items should also be returned
     * @param string $userId the name of the user
     * @return array of items
     */
    public function findAllNew($id, $type, $updatedSince, $showAll, $userId){
        switch($type){
            case FeedType::FEED:
                return $this->itemMapper->findAllNewFeed(
                    $id, $updatedSince, $showAll, $userId
                );
            case FeedType::FOLDER:
                return $this->itemMapper->findAllNewFolder(
                    $id, $updatedSince, $showAll, $userId
                );
            default:
                return $this->itemMapper->findAllNew(
                    $updatedSince, $type, $showAll, $userId
                );
        }
    }


    /**
     * Returns all items
     * @param int $id the id of the feed, 0 for starred or all items
     * @param int $type the type of the feed
     * @param int $limit how many items should be returned
     * @param int $offset the offset
     * @param boolean $showAll if unread items should also be returned
     * @param boolean $oldestFirst if it should be ordered by oldest first
     * @param string $userId the name of the user
     * @param string[] $search an array of keywords that the result should
     * contain in either the author, title, link or body
     * @return array of items
     */
    public function findAll($id, $type, $limit, $offset, $showAll, $oldestFirst,
                            $userId, $search=[]){
        switch($type){
            case FeedType::FEED:
                return $this->itemMapper->findAllFeed(
                    $id, $limit, $offset, $showAll, $oldestFirst, $userId,
                    $search
                );
            case FeedType::FOLDER:
                return $this->itemMapper->findAllFolder(
                    $id, $limit, $offset, $showAll, $oldestFirst, $userId,
                    $search
                );
            default:
                return $this->itemMapper->findAll(
                    $limit, $offset, $type, $showAll, $oldestFirst, $userId, $search
                );
        }
    }


    /**
     * Star or unstar an item
     * @param int $feedId the id of the item's feed that should be starred
     * @param string $guidHash the guidHash of the item that should be starred
     * @param boolean $isStarred if true the item will be marked as starred,
     * if false unstar
     * @param string $userId the name of the user for security reasons
     * @throws ServiceNotFoundException if the item does not exist
     */
    public function star($feedId, $guidHash, $isStarred, $userId){
        try {
            /** @var Item $item */
            $item = $this->itemMapper->findByGuidHash(
                $guidHash, $feedId, $userId
            );

            $item->setStarred($isStarred);

            $this->itemMapper->update($item);
        } catch(DoesNotExistException $ex) {
            throw new ServiceNotFoundException($ex->getMessage());
        }
    }


    /**
     * Read or unread an item
     * @param int $itemId the id of the item that should be read
     * @param boolean $isRead if true the item will be marked as read,
     * if false unread
     * @param string $userId the name of the user for security reasons
     * @throws ServiceNotFoundException if the item does not exist
     */
    public function read($itemId, $isRead, $userId){
        try {
            $lastModified = $this->timeFactory->getMicroTime();
            $this->itemMapper->readItem($itemId, $isRead, $lastModified, $userId);
        } catch(DoesNotExistException $ex) {
            throw new ServiceNotFoundException($ex->getMessage());
        }
    }


    /**
     * Set all items read
     * @param int $highestItemId all items below that are marked read. This is
     * used to prevent marking items as read that the users hasn't seen yet
     * @param string $userId the name of the user
     */
    public function readAll($highestItemId, $userId){
        $time = $this->timeFactory->getMicroTime();
        $this->itemMapper->readAll($highestItemId, $time, $userId);
    }


    /**
     * Set a folder read
     * @param int $folderId the id of the folder that should be marked read
     * @param int $highestItemId all items below that are marked read. This is
     * used to prevent marking items as read that the users hasn't seen yet
     * @param string $userId the name of the user
     */
    public function readFolder($folderId, $highestItemId, $userId){
        $time = $this->timeFactory->getMicroTime();
        $this->itemMapper->readFolder(
            $folderId, $highestItemId, $time, $userId
        );
    }


    /**
     * Set a feed read
     * @param int $feedId the id of the feed that should be marked read
     * @param int $highestItemId all items below that are marked read. This is
     * used to prevent marking items as read that the users hasn't seen yet
     * @param string $userId the name of the user
     */
    public function readFeed($feedId, $highestItemId, $userId){
        $time = $this->timeFactory->getMicroTime();
        $this->itemMapper->readFeed($feedId, $highestItemId, $time, $userId);
    }


    /**
     * This method deletes all unread feeds that are not starred and over the
     * count of $this->autoPurgeCount starting by the oldest. This is to clean
     * up the database so that old entries don't spam your db. As criteria for
     * old, the id is taken
     */
    public function autoPurgeOld(){
        $count = $this->config->getAutoPurgeCount();
        if ($count >= 0) {
            $this->itemMapper->deleteReadOlderThanThreshold($count);
        }
    }


    /**
     * Returns the newest item id, use this for marking feeds read
     * @param string $userId the name of the user
     * @throws ServiceNotFoundException if there is no newest item
     * @return int
     */
    public function getNewestItemId($userId) {
        try {
            return $this->itemMapper->getNewestItemId($userId);
        } catch(DoesNotExistException $ex) {
            throw new ServiceNotFoundException($ex->getMessage());
        }
    }


    /**
     * Returns the starred count
     * @param string $userId the name of the user
     * @return int the count
     */
    public function starredCount($userId){
        return $this->itemMapper->starredCount($userId);
    }


    /**
     * @param string $userId from which user the items should be taken
     * @return array of items which are starred or unread
     */
    public function getUnreadOrStarred($userId) {
        return $this->itemMapper->findAllUnreadOrStarred($userId);
    }


    /**
     * Deletes all items of a user
     * @param string $userId the name of the user
     */
    public function deleteUser($userId) {
        $this->itemMapper->deleteUser($userId);
    }


    /**
     * Regenerates the search index for all items
     */
    public function generateSearchIndices() {
        $this->itemMapper->updateSearchIndices();
    }

}
